. Contributions to Canadian biology. Marine biology; Natural history. No. 87. Sertularella polyzonias. SrHularella nif/osa (Lmiuh'us). Trophosome. Colony small, stem usually un- branched, constricted at regular intervals; alternate, rather distinct, fusiform, distinctly rugose; margin with four tentacles; operculum with four flaps. Gonosome. Gonangia oval, rugose; margin with four teeth. Serhilarella tricuspidata (Alder). Trophosome. Stem slender, lax, branching irregu- larly alternate or dichotomous; hydrothecae alternate, very slightly immersed, tubular, sometimes curved; margin
. Contributions to Canadian biology. Marine biology; Natural history. No. 87. Sertularella polyzonias. SrHularella nif/osa (Lmiuh'us). Trophosome. Colony small, stem usually un- branched, constricted at regular intervals; alternate, rather distinct, fusiform, distinctly rugose; margin with four tentacles; operculum with four flaps. Gonosome. Gonangia oval, rugose; margin with four teeth. Serhilarella tricuspidata (Alder). Trophosome. Stem slender, lax, branching irregu- larly alternate or dichotomous; hydrothecae alternate, very slightly immersed, tubular, sometimes curved; margin with three teeth; operculum with three flaps. Gonosome. Gonangia oval, with strongly crested rugosities; a small, smooth tubular neck bears the aper- No. ss. Sn-tnlarella Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biological Board of Canada; Canada. Marine Biological Station. Toronto, Biological Board of Canada
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